WO2012097611A1

WO2012097611A1 - Method and device for automatic protection switching in optical network

Info

Publication number: WO2012097611A1
Application number: PCT/CN2011/080639
Authority: WO
Inventors: 王磊
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-01-19
Filing date: 2011-10-11
Publication date: 2012-07-26
Also published as: CN102075245A

Abstract

Disclosed are a method and a device for automatic protection switching in an optical network, wherein the method includes: detecting the signal intensities of a working channel and a protecting channel in the optical network; and carrying out the switch when a switch trigger condition is satisfied according to the detected signal intensities of the working channel and protecting channel. The present invention compares the performance of the working channel with the protecting channel by comparing the optical power difference between the working channel and the protecting channel with a relative optical power threshold, and achieves automatic switching from the working channel to the protecting channel when the power value of the protecting channel exceeds that of the working channel and reaches the trigger condition, thereby making the working performance of the system optimal.

Description

Optical network automatic protection switching method and device

Technical field

The present invention relates to the field of optical communication technologies, and in particular, to an optical network automatic protection switching method and apparatus. Background technique

In optical communication systems, optical cable cuts, equipment failures, or optical connectors being pulled out can cause service interruptions. Therefore, optical network protection is very important. For the transmission segment to be protected, the working channel and the protection channel can be configured to transmit services at the same time. When the working channel encounters a fault, the system automatically selects the protection channel to continue the transmission service, thereby ensuring that the communication link is not interrupted.

FIG. 1 is a schematic diagram of an optical network automatic protection switching principle. As shown in FIG. 1 , at the transmitting end, an optical signal for loading a service is divided into two channels by a splitter: one is a working channel, and the other is a protection channel; At the receiving end, the receiving unit selects one of the channels for receiving. The detection control unit completes the detection of the optical power of the two channels and the control of the receiving unit. When the network works normally without failure, the working channel and the protection channel transmit the service at the same time, and the receiving unit selects the working channel to receive; when the working channel fails, the detecting control unit detects that the working channel has no light, and then issues a switching command to automatically switch the receiving unit. To the protection channel, to ensure that the communication link is not interrupted due to the failure of the working channel.

It can be seen that the core of the automatic protection switching device is the detection control unit. However, the basic method of detecting the control unit is to detect whether the working channel and the protection channel are abnormal. If the working channel is abnormal and the protection channel is normal, it is switched to the protection channel. Summary of the invention

The technical problem to be solved by the present invention is to provide an optical network automatic protection switching method and device, which can realize flexible switching of channels and optimize system performance.

To solve the above technical problem, the present invention provides an optical network automatic protection switching method, where the method includes:

Detecting the signal strength of the working channel and the protection channel of the optical network respectively; According to the detected signal strengths of the working channel and the protection channel, when the switching trigger condition is met, the switching is performed.

Preferably, the switching triggering condition includes:

When the working channel and the protection channel are both working normally, the signal strength of the protection channel is greater than the signal strength of the working channel, and the difference between the signal strength of the protection channel and the signal strength of the working channel is 'J scheduled conversion threshold.

Preferably, the signal strength comprises an optical power value;

The predetermined switching width is a relative optical power threshold.

Preferably, the above method further includes:

When the detected signal strengths of the working channel and the protection channel are both greater than a predetermined threshold, it is determined that the working channel and the protection channel are working normally.

Preferably, the switching triggering condition further includes:

The signal strength of the working channel is less than a predetermined threshold, and the signal strength of the protection channel is greater than a predetermined threshold.

Preferably, the method further includes:

When no light signal is detected at the transmitting end, no switching is performed.

The present invention also provides an optical network automatic protection switching device, the device comprising: a detecting module, configured to: detect a signal strength of a working channel and a protection channel of the optical network; and a first comparing unit, configured to: Whether the working channel and the protection channel are working properly;

a second comparing unit, configured to: when the working channel and the protection channel of the optical network work normally, compare the detected signal strengths of the working channel and the protection channel; and a control module, where: According to the comparison result of the second comparison unit, when the switching trigger condition is satisfied, the switching is performed.

Preferably, the control module is configured to determine, according to the comparison result of the second comparison unit, whether the following trigger trigger condition is met: the signal strength of the protection channel is greater than the signal strength of the working channel, and the protection The difference between the signal strength of the channel and the signal strength of the working channel Reach the predetermined switching threshold;

The signal strength includes an optical power value; and the predetermined switching threshold is a relative optical power threshold.

Preferably, the first comparing unit is configured to determine whether the working channel and the protection channel are working normally by:

Preferably, the control module is further configured to determine, according to the determination result of the first comparison unit, whether the following trigger trigger condition is met: the signal strength of the working channel is less than a predetermined threshold, and the signal of the protection channel The intensity is greater than the predetermined threshold.

Preferably, the detecting module is further configured to detect whether the transmitting end has no optical signal;

The control module is further configured to not perform any switching if a no-light signal is detected at the transmitting end. The above solution is to set two comparison units, the first comparison unit completes the comparison between the optical power value of the two channels and the optical power threshold, and is used for detecting whether the working channel and the protection channel are working normally, the second comparison channel performance comparison, and the protection channel The automatic switching of the working channel to the protection channel is realized when the power value exceeds the working channel to reach the trigger condition. At the same time, the optical power value is completed by the high-speed A/D unit, which complements the comparison unit circuit. In addition, the optical power of the transmitting unit is also monitored by the transmitting unit. If the optical power entering the transmitting unit is lower than the normal value, it indicates that a fault occurs in the upstream of the protected line, and the protection segment will not perform any switching action. . BRIEF abstract

The drawings are intended to provide a further understanding of the embodiments of the present invention, and are intended to be a part of the present invention, and the description of the present invention is not intended to limit the invention. In the drawing:

FIG. 1 is a schematic diagram of an optical network automatic protection switching principle;

2 is a schematic diagram of a composition of an optical network automatic protection switching device according to an embodiment of the present invention; and FIG. 3 is a schematic diagram of a composition of an optical network automatic protection switching device according to an application example of the present invention. Preferred embodiment of the invention

An embodiment of the present invention provides an optical network automatic protection switching mechanism: when both the working channel and the protection channel are normal, the receiving end detects and compares the performance of the two channels, and adaptively selects the performance of the two channels. The channel acts as a working channel, that is, if the performance of the protection channel is better than that of the working channel, then switching is performed.

The embodiments of the present invention will be further described in detail below with reference to the drawings and specific embodiments. It should be noted that, in the case of no conflict, the features in the embodiments and the embodiments in the present application may be arbitrarily combined with each other.

The optical network automatic protection switching method of the embodiment of the present invention uses the following technical solutions: respectively detecting the signal strength of the working channel and the protection channel of the optical network;

According to the detected signal strengths of the working channel and the protection channel, switching is performed when the switching trigger condition is satisfied.

The switching triggering conditions include:

When both the working channel and the protection channel are working normally, the signal strength of the protection channel is greater than the signal strength of the working channel, and the difference between the signal strength of the protection channel and the signal strength of the working channel reaches a predetermined value. Reverse the threshold.

Preferably, the signal strength comprises an optical power value;

The predetermined switching width is a relative optical power threshold.

Preferably, it is determined whether the working channel and the protection channel are working normally: when the detected signal strengths of the working channel and the protection channel are greater than a predetermined threshold, determining that the working channel and the protection channel are both Working normally.

Preferably, the switching triggering condition further includes:

Preferably, the method further includes:

When no light signal is detected at the transmitting end, no switching is performed. As shown in FIG. 2, the optical network automatic protection switching device of the embodiment of the present invention mainly includes: a detecting module, a first comparing unit, a second comparing unit and a control module, and a high speed collecting unit.

The detection module is configured to detect signal strengths of the working channel and the protection channel, such as optical power values.

The first comparison unit is configured to complete the comparison between the optical power values of the two channels and the threshold. If the value is higher than the threshold, the channel is determined to be working normally. Otherwise, the channel is determined to be abnormal. When it is determined that the working channel is abnormal and the protection channel is normal, the control module performs switching, and the control receiving unit selects the protection channel to receive;

The second comparison unit is configured to compare the difference between the two channels and the relative threshold. If it is determined that the performance of the working channel is degraded, and the switching trigger condition is met (for example, the optical power of the working channel is low and the difference from the protection channel is greater than the optical power) The threshold value, then the control module will also perform the switching, and the control receiving unit selects the protection channel to receive. It can be seen that the comparison result of the second comparison unit is valid only under the condition that the first comparison unit judges that both channels are working normally.

The high-speed concentrating unit is set to complete the sampling and calculation of the optical power, and the part and the comparison unit complement each other to improve the survivability and reliability of the system.

In addition, the detection module is further configured to detect whether the transmitting end has no optical signal, and if performing a signal that detects no light, no switching is performed.

FIG. 3 shows an optical network automatic protection switching device according to an application example of the present invention. As shown in FIG. 3, the detection module is configured to detect a channel optical power value, for example, a 5/95 coupler can be used to detect the optical power of a 5% signal. . The detection module of the present example includes a first detection unit and a second detection unit, wherein the first detection unit is configured to detect an optical power value of the working channel; and the second detection unit is configured to detect an optical power value of the protection channel.

Referring to FIG. 3, in this example, the first comparison unit is composed of a comparator and an optical power threshold, and the second comparison unit is composed of a subtractor, a comparator, and a relative optical power threshold. The first comparison unit is configured to determine, by the comparator, whether the detected optical power value is greater than a predetermined optical power threshold, to determine whether the working channel and the protection channel work normally, and send the identifier The signal is sent to the control module, and the judgment result is output to the control module, and the control module determines whether the switching trigger condition is satisfied, for example, if the working channel fault causes the optical power value to be lower than the optical power threshold and the protection channel is normal, then the control receiving unit is controlled. Perform a switchover.

The second comparison unit is configured to compare the detected signal strengths of the working channel and the protection channel when the working channel and the protection channel of the optical network are working normally, and issue an identification signal, and output the comparison result to The control module determines, by the control module, whether the triggering condition is met: if the working channel and the protection channel are both above the optical power threshold, and the optical power value of the working channel is lower and the difference between the optical power value of the protection channel is greater than the relative optical power threshold, The control module will control the receiving unit to perform the switching; if the working channel optical power value is lower, the difference between the working channel optical power value and the protection channel optical power value is less than the relative optical power threshold, or the working channel optical power value is greater than the protection channel The optical power value, then the control module will not perform the switching.

In addition, the detection module may further detect whether the transmitting end has no optical signal, and if yes, issue a no-light identification signal to the control module; and the control module needs to confirm whether it receives no light from the detecting unit when performing any switching. The identification signal, if received, does not perform any switching.

The high-speed gathering unit can be realized by a high-speed A/D module, which is disposed between the detecting module and the control module, and is used for converting the analog signal into a digital signal and outputting to the control module, and the control module receives the high-speed AD signal and uses the software. Calculate whether the working channel and the protection channel work normally, and complement each other with the hardware comparison circuit. In addition to the optical power detection, the high-speed A/D module can be supplemented with the comparison unit and reported to each other as a backup.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. The present invention may be embodied in various other embodiments without departing from the spirit and scope of the invention. Various changes and modifications may be made to the invention, and such changes and modifications are intended to be included within the scope of the appended claims.

Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. Perform the steps shown or described, or They are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.

Industrial applicability

In the foregoing embodiment, by setting two comparison units, the first comparison unit completes comparison between the optical power value of the two channels and the optical power threshold, and is used to detect whether the working channel and the protection channel are working normally, and the performance of the second protection channel is compared and protected. When the power value of the channel exceeds the trigger condition of the working channel, the automatic switching of the working channel to the protection channel is realized. At the same time, the value of the optical power value is completed by the high-speed A/D unit, which complements the comparison unit circuit. In addition, the optical power of the transmitting unit is also monitored by the transmitting unit. If the optical power entering the transmitting unit is lower than the normal value, it indicates that a fault occurs in the upstream of the protected line, and the protection segment will not perform any switching action. .

Claims

Claim

An optical network automatic protection switching method, where the method includes:

Detecting the signal strength of the working channel and the protection channel of the optical network separately;

2. The method according to claim 1, wherein the switching triggering condition comprises: when both the working channel and the protection channel are working normally, the signal strength of the protection channel is greater than the signal strength of the working channel, And the difference between the signal strength of the protection channel and the signal strength of the working channel reaches a predetermined switching threshold of 'J.

3. The method according to claim 1 or 2, wherein

The signal strength includes an optical power value;

The predetermined switching width is a relative optical power threshold.

4. The method of claim 2, the method further comprising:

The method of claim 4, wherein the switching triggering condition further comprises: the signal strength of the working channel is less than a predetermined threshold, and the signal strength of the protection channel is greater than a predetermined threshold.

6. The method according to any one of claims 1, 2 or 4, further comprising: when detecting a no-light signal at the transmitting end, performing no switching.

7. An optical network automatic protection switching device, the device comprising:

a detecting module, configured to: detect a signal strength of a working channel and a protection channel of the optical network; and a first comparing unit configured to: determine whether the working channel and the protection channel work normally;

a second comparison unit, configured to: compare the detected signal strengths of the working channel and the protection channel when both the working channel and the protection channel of the optical network are working normally; And a control module, configured to: perform switching according to a comparison result of the second comparison unit when the switching trigger condition is met.

8. The apparatus according to claim 7, wherein

The control module is configured to determine, according to a comparison result of the second comparison unit, whether the following trigger trigger condition is met: a signal strength of the protection channel is greater than a signal strength of the working channel, and a signal strength of the protection channel a difference from a signal strength of the working channel reaching a predetermined switching threshold;

9. The apparatus according to claim 7, wherein

The first comparing unit is configured to determine whether the working channel and the protection channel are working normally by:

10. The apparatus according to claim 9, wherein

The control module is further configured to determine, according to the determination result of the first comparison unit, whether the following trigger trigger condition is met: the signal strength of the working channel is less than a predetermined threshold, and the signal strength of the protection channel is greater than a predetermined Wide value.

11. The device according to any one of claims 7, 8, 9 or 10, wherein

The detecting module is further configured to detect whether the transmitting end has no optical signal;

The control module is further configured to: if no signal is detected at the transmitting end, no switching is performed.